diff --git a/src/mswm/build_inputs.py b/src/mswm/build_inputs.py
index 938fc6f0..abac43ba 100644
--- a/src/mswm/build_inputs.py
+++ b/src/mswm/build_inputs.py
@@ -593,11 +593,9 @@ def _parse_forcing_engine(self):
 
         # Raise error if forecast or cold start is run with CSV provider
         if self.forcing_provider == 'csv' and self.run_type in ('forecast', 'cold_start'):
-            try:
-                raise ValueError(f"Run type {self.run_type} requires bmi forcing provider")
-            except ValueError as e:
-                logger.critical(e)
-                raise
+            msg = f"Run type {self.run_type} requires bmi forcing provider, but {repr(self.forcing_provider)} was provided"
+            logger.critical(msg)
+            raise ValueError(msg)
 
         # Retrieve cold_start_time
         self.cold_start_datetime = self.forcingSec.get('cold_start_datetime', None)
@@ -626,8 +624,9 @@ def _parse_forcing_engine(self):
                 elif self.use_lagged_ens:
                     # Check that use_lagged_ens is only used with medium_range configuration
                     if self.forcing_configuration != "medium_range":
-                        logger.critical(f"Lagged ensemble run must use medium range forcing configuration. {self.forcing_configuration} configuration cannot be used for a lagged ensemble.")
-                        raise
+                        msg = f"Lagged ensemble run must use medium range forcing configuration. {self.forcing_configuration} configuration cannot be used for a lagged ensemble."
+                        logger.critical(msg)
+                        raise ValueError(msg)
                     self.forcing_configuration_str = f"{self.forcing_configuration}_{self.lagged_ens_mem}_config.yml"
                 else:
                     self.forcing_configuration_str = f"{self.forcing_configuration}_config.yml"
diff --git a/src/mswm/manager.py b/src/mswm/manager.py
index d5a7894b..68e84d3c 100644
--- a/src/mswm/manager.py
+++ b/src/mswm/manager.py
@@ -6,7 +6,7 @@
 
 import argparse
 from mswm.build_inputs import RealizationBuilder, validate_topoflow_glacier
-
+from mswm.utils.input_configuration import InputConfig
 
 def build_default(input_path: str, use_cold_start: bool = False):
     """
@@ -26,9 +26,10 @@ def build_calib(input_path: str):
     return real_path
 
 
-def build_fcst(input_path: str, valid_yaml: str, fcst_run_name: str, use_cold_start: bool = False, use_warm_start: bool = False,
+def build_fcst(input_path: str | None, valid_yaml: str, fcst_run_name: str, use_cold_start: bool = False, use_warm_start: bool = False,
                use_hindcast: bool = False, use_lagged_ens: bool = False, hind_cycle: int | None = None, prev_hind_cycle: int | None = None,
-               lagged_ens_mem: str | None = None, forcing_lag: int | None = None, load_state_from: str = None, save_state: bool = False):
+               lagged_ens_mem: str | None = None, forcing_lag: int | None = None, load_state_from: str = None, save_state: bool = False,
+               config_overrides: InputConfig = None):
     """
     Call RealizationBuilder class to generate forecast realization and config files
     """
@@ -36,7 +37,7 @@ def build_fcst(input_path: str, valid_yaml: str, fcst_run_name: str, use_cold_st
                             use_cold_start=use_cold_start, use_warm_start=use_warm_start, use_lagged_ens=use_lagged_ens,
                             use_hindcast=use_hindcast, hind_cycle=hind_cycle, prev_hind_cycle=prev_hind_cycle,
                             lagged_ens_mem=lagged_ens_mem, forcing_lag=forcing_lag,
-                            load_state_from=load_state_from, save_state=save_state)
+                            load_state_from=load_state_from, save_state=save_state, config_overrides=config_overrides)
     real_path = rb.build_fcst_realization()
     return real_path